Thin loudspeaker

Abstract

A thin loudspeaker is provided. The thin loudspeaker includes a small magnet and a thin coil diaphragm. The coil diaphragm has a plurality of planar coils and a membrane. The membrane has a plurality of laminated substrates. The planar coils are interconnected, stacked, and respectively formed on the substrates. The magnet is disposed to contact the underside of the coil diaphragm along the common central axis of the planar coils.

What is claimed is: 
     
       1. A thin loudspeaker, comprising:
 a magnet; and 
 a coil diaphragm, including a plurality of planar coils and a membrane, wherein the membrane has a plurality of laminated substrates, and the plurality of planar coils are interconnected, stacked and respectively formed on the substrates; 
 wherein the magnet is disposed to contact the underside of the coil diaphragm along the common central axis of the plurality of planar coils. 
 
     
     
       2. The thin loudspeaker according to  claim 1 , wherein the membrane is a flexible circuit board. 
     
     
       3. The thin loudspeaker according to  claim 1 , further comprising a resonance box, interacting with the magnet and the coil diaphragm. 
     
     
       4. The thin loudspeaker according to  claim 3 , further comprising a magnet holder, wherein the magnet is attached to the resonance box by the magnet holder. 
     
     
       5. The thin loudspeaker according to  claim 1 , further comprising a fixing ring, wrapping around the coil diaphragm. 
     
     
       6. A thin loudspeaker, comprising:
 a plurality of magnets; and 
 a coil diaphragm, including a plurality of planar coils and a membrane, wherein the membrane has two laminated substrates, and the planar coils are interconnected and dispersedly formed on the substrates; 
 wherein the magnets respectively correspond to the planar coils, and are disposed to contact the underside of the coil diaphragm along the central axis of a respective corresponding planar coil. 
 
     
     
       7. The thin loudspeaker according to  claim 6 , wherein the membrane is a flexible circuit board. 
     
     
       8. The thin loudspeaker according to  claim 6 , further comprising a resonance box, interacting with the magnets and the coil diaphragm. 
     
     
       9. The thin loudspeaker according to  claim 8 , further comprising a plurality of magnet holders, wherein the magnets are attached to the resonance box by the magnet holders. 
     
     
       10. The thin loudspeaker according to  claim 6 , further comprising a fixing ring, wrapping around the coil diaphragm.